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A230815
Number of nX4 0..2 arrays x(i,j) with each element horizontally or vertically next to at least one element with value (x(i,j)+1) mod 3 and at least one element with value (x(i,j)-1) mod 3, and upper left element zero
1
0, 0, 12, 174, 816, 12210, 108006, 1202184, 11797696, 124336446, 1262910682, 13078190344, 134042691720, 1381544758264, 14197831448766, 146130421941262, 1502841078520490, 15462124587630982, 159048324563923546
OFFSET
1,3
COMMENTS
Column 4 of A230819
FORMULA
Empirical recurrence of order 95 (see link above)
EXAMPLE
Some solutions for n=4
..0..2..1..0....0..1..2..0....0..1..0..2....0..2..1..0....0..1..2..0
..1..0..1..2....2..1..0..1....2..2..0..1....1..1..0..2....2..0..0..1
..2..0..1..0....1..1..0..2....1..1..0..2....2..0..0..1....1..0..2..2
..1..0..2..1....0..2..1..0....0..2..0..1....0..1..2..0....0..2..1..0
CROSSREFS
Sequence in context: A366235 A239335 A120662 * A099930 A307549 A052208
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 30 2013
STATUS
approved